Question

a) x - 3 = 9

b) 4x - 9 = 1 - 2x

c) 3x + 5 = 20 - x

d) 9x + 10 = 7x - 30​

Answer 1

a) x - 3 = 9

x = 9 + 3

x = 12

b) 4x - 9 = 1 - 2x

4x + 2x = 1 + 9

6x = 10

x = 10/6

x = 5/3

c) 3x + 5 = 20 - x

3x + x = 20 - 5

4x = 15

x = 15/4

d) 9x + 10 = 7x - 30​

9x - 7x = -30 + 10

2x = -20

x = -20/2

x = -10